Self-Cleaning Hydrodynamic Face Seal for Steam Turbines
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Solution Overview
Problem
Steam turbine engines face challenges in maintaining hydrodynamic face seals due to debris and contaminant buildup, which affects performance and is exacerbated by their large size, making maintenance complex and inefficient.
Innovation Solution
A self-cleaning hydrodynamic face seal system is introduced, featuring a seal ring with a radially-extending surface and coupled brushes with flexible elements that continuously remove debris and contaminants from the hydrodynamic features, reducing process fluid leakage and improving seal efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If hydrodynamic face seals are used to reduce process fluid leakage, then sealing effectiveness is improved, but debris and contaminants accumulate in the hydrodynamic grooves, affecting seal performance
Solution Approach 1:
The brush seal integrates a self-cleaning mechanism directly into the sealing system. The brush elements continuously contact and remove debris from the hydrodynamic grooves of the face seal rings, enabling the seal to maintain its performance without external intervention or manual cleaning for extended periods.
Solution Approach 2:
The brush seal actively removes and discards accumulated debris from the hydrodynamic grooves. By continuously sweeping away contaminants, the brush prevents debris buildup that would otherwise degrade sealing effectiveness, thereby recovering and maintaining optimal seal performance over time.
2Productivity
If steam turbine engines operate continuously for years, then productivity is improved, but debris buildup in seal grooves increases, requiring complex maintenance
Solution Approach 1:
The brush seal provides continuous self-cleaning during operation, automatically removing debris from the hydrodynamic grooves. This eliminates the need for frequent manual disassembly and cleaning, allowing the turbine to operate continuously for years without complex maintenance interventions.
Solution Approach 2:
The brush seal maintains continuous cleaning action throughout the operational life of the turbine. Rather than requiring periodic shutdowns for maintenance, the brush continuously removes debris, enabling uninterrupted operation and simplifying maintenance schedules.
3Power
If large diameter shafts are used in steam turbine engines, then power output is improved, but seal maintenance becomes more difficult due to increased component size
Solution Approach 1:
The brush seal automatically cleans the hydrodynamic grooves on large diameter shafts during rotation, eliminating the need for manual access to difficult-to-reach areas. This self-cleaning capability makes maintenance equally simple regardless of shaft diameter, allowing large power output without proportionally increased maintenance difficulty.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The self-cleaning hydrodynamic face seal significantly reduces process fluid leakage, maintains seal effectiveness, and simplifies maintenance by continuously removing debris and contaminants, thereby enhancing the performance and longevity of rotary machines.
Implementation Method 1
at least one brush coupled to the seal ring. The at least one brush includes a plurality of flexible elements
Implementation Method 2
the hydrodynamic grooves in the rotating ring generate a hydrodynamic force that causes the stationary ring to lift or separate from the rotating ring
Data Source
AI summary
A self-cleaning hydrodynamic face seal for use with a rotary machine is provided. The hydrodynamic face seal includes a seal ring having a radially-extending seal face. In addition, the hydrodynamic face seal includes at least one brush coupled to the seal ring. The at least one brush includes a plurality of flexible elements extending away from the radially-extending seal face of the face seal ring.